package com.lilei.bigdata.mr.wordcount;

import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Reducer;

import java.io.IOException;

/**
 * KEYIN, VALUEIN 对应  mapper输出的KEYOUT,VALUEOUT类型对应
 *
 * keyout 是单词
 * valueout 是单词出现的次数
 */
public class WordCountReducer extends Reducer<Text, IntWritable, Text, IntWritable> {

    @Override
    protected void reduce(Text key, Iterable<IntWritable> values, Context context) throws IOException, InterruptedException {
        int count = 0;
        for(IntWritable value:values){

            count += value.get();

        }
        context.write(key,new IntWritable(count));
    }
}
